A homogeneous SiO2-Na2O-Fe2O3 glass containing 4.6% Fe2O3 was prepared and devitrified to produce a glass ceramic containing the magnetic compound Na5Fe(SiO3)4. The DC magnetic susceptibility measurements performed on both samples have shown that the magnetic ion-ion interaction is antiferromagnetic and is stronger in the crystallized sample. It was also shown that M versus H data at different temperatures do not collapse to a single curve in the M versus H/T representation, for either the glass or the heat treated sample. But the spread of the data is larger in the heat treated sample, further indicating a stronger interaction in the crystalline sample. The M versus H curves for the glass sample were fitted with Brillouin function by keeping the total number of magnetic ions constant and varying the proportion of ferrous ions until a best fit was achieved. The [Fe2+]/[Fetotal] ratio obtained from the fit is in good agreement with the value obtained from X-ray photoelectron spectroscopy (XPS) performed on the glass sample.
Bibliographical noteFunding Information:
The authors would like to acknowledge the support of King Fahd University of Petroleum and Minerals. We would also like to thank Dr. D. Holland for helpful discussions.
- Glass ceramic
- Magnetic glasses
- Redox state of iron
- Transition metal glasses
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics